Method of making bungs



May 14, 1940.

C. E. SHEPARD METHOD OF MAKING BUNGS Filed May 3, 1937 Patented May 14, 1940 UNITED STATI-:s

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MJFENTV oFFlcE 2,200,583 METHoDoF MAKING BUNG'S Cleo E. Shepard, Chicagm'lll. Application May s', i937, saranno'. 140,353 j 5 Claims.Y (o1. ,e9- 1482) l This application is a continuation in partuoiv my copending application Serial No. 66,142 filed February 28, 1936. p

The above identied copending application relates to a novel bung comprisinga body portion formed from sheet metal, anda transverse handle member which is located within the body. The present invention relates to methodswhereby such a bung may be ma-de.

The invention will readily be understood from the following description, taken in conjunction with the accompanying drawing, in which:

Figure 1 is an elevational view, partly in cross section, of a set of dies suitable for making th improved bung body;

Fig. 2 is an elevational view, partly in cross section, of a similar die suitable for assembling the wrench engaging bar to the bung body;

Fig. 3 is an elevational View of a similar die, partly in cross section, suitable for forming the body of the bung and assembling the wrench engaging bar in the same operation;

Fig. 4 is a plan view of the blank from which the body of the bung is formed;

Fig. 5 is a plan View of a bung body;

Fig. 6 is a plan view of a bung body provided with a wrench engaging bar;

Fig. 7 is a plan view of the the wrench engaging bar; and

Fig. 8 is an elevational View, partly in section, of the completed bung.

Referring to the drawing; in Fig. l the upper die consists of a ring I Whose inside diameter I I corresponds with the outside shape and diameter of the bung body desired. Inside this ring Il) is a member I2 which serves to eject the formed bung body. The lower die consists of a ring I3 which has a seat I4 to receive the blank I'I from which the bung body is made. The ring I3 rests on pins I5 supported in turn by suitable compression means (not shown). The ring I3 surrounds preferred form of a punch I6 of the shape and size of the inside of the bung body desired.

It will readily be understood by those skilled in the art that the dies shown in Fig. 1 will operate on a blank I1 (Fig. 4) to provide a cup-shaped body such as is shown in Fig. 5. This body comprises a bottom portion 23, a cylindrical wall portion 24 extending upwardly therefrom, and a peripheral ange 25 at the upper end of the cylindrical wall. This ange 25 may be of any conventional type such as the narrow undercut ange as shown in Fig. 8 or of the wider type to cover a Wide flat gasket.

The bung described and claimed in my aforesaidy copending application includes a bar or wrench engagingl member ZI, hardened or of harder material than -the bung body, having' relatively sharp corners 22. The rpreferred form of this bar is shown in Fig. 7, but it may have ends shaped in various ways or may be made of folded sheet metal. VThis bar is somewhat longer, atleast at its sharp edges, than the inside diameterof the cylindrical portion 24 of the bung body, so that when forced into the body the corners 22 cut into the relatively softer stock of the bung body, with the result that the bar is rigidly mounted` in place within the body and may be engaged by a wrench to apply torque for application to and removal from a bung hole.

The bar 2l may suitably be applied to the bung body by means of the dies shown in Fig. 2. These dies are similar to those used for forming ther body except that the-seat I 9 in the lower die ring i8 is made to t the lflange of the previously formed body and the die punch 2D is slotted to` receive the bar 2 I. A bung Abody as'sliown in Fig. 5, formed Abythe dies shown in Fig. 1, is set in the seat I9 after a bar .2i is centrally located in the slot `in the punchv 20. -The top die is caused to approach the lower die, and the 1 body portion is forced into .the ring IIJ. As the operation continues the b odyiis forced overthe punch 20 and at the same time over the protruding edges of the bar ZI. The edges of the bar cut into the inside cylindrical wall of the body. At the end of the operation the body wall is finished over the open ends of the slots so cut, so that these slots are deformed and closed, thereby permanently securing the bar in place within the body of the bung.

In a modified method of producing ymy improved bung, the body portion may be formed and the wrench engaging bar securely installed therein in the same and single operation. This may be done with the aid of the dies shown in Fig.v 3. For this purpose a bar 2| is centrally located in the slot in the punch 20, a blank is placed in the seat I4 in the ring I3, and the upper die is caused to approach the lower die. Thus the bung body is formed around the bar and instead of the protruding edges being made to cut into the body wall the metal of the body is forced to flow around the protruding ends of the bar, so that when the forming of the body is completed the bar ends are securely embedded in the walls of the body. The result is that the assembly is for all practical purposes identical with the assembly previously described.

The exact form of the bar ends is immaterial but at its edges at least it must be longer than the inside diameter of the body portion.

After the bung is thus finished by either of the methods described, it can be threaded and if desired an undercut gasket seat may be cut.

It is to be noted that I have produced a bung in an economical and simple manner from a sheet metal blank and a bar.

Having thus described my invention, what I claim is:

l. The method of making a bung, which comprises making a cup-shaped member, making a bar that is substantially harder than the material of the cup and having sharp cutting edges at its ends, the length of the bar between cutting edges on one side of the bar being slightly greater than the normal chord of the cup between the points Where the cutting edges engage the cup walls when the bar is located diametrically within the cup, forcing the bar into the cup diametrically across it so that the sharp edges of the bar are caused to cut into the walls of the cup throughout the distance the bar is inserted in the cup, the engaging of the ends of the bar and the side walls of the cup preventing forced rotation o the bar in relation to the cup-shaped member.

2. The method of making a bung, which comprises making a cup-shaped member having an externally extending peripheral ange at its open end, making a bar that is substantially harder than the material of the cup and having sharp cutting edges along its ends, the length of the bar between the cutting edges on one side being slightly greater than the normal chord of the cup between the points where the cutting edges engage the cup walls when the bar is located diametrically within the cup, lforcing the bar into the cup diametrically across it so that the sharp edges of the bar are caused to cut into the Walls of the cup throughout the distance the bar is inserted in the cup, the engaging of the ends of the bar and the side Walls of the cup preventing forced rotation of the bar in relation to the cup-shaped member, and thereafter cutting a screw thread on the external wall of the cup.

3. The method of making a bung, which comprises making a cup-shaped member, making a bar that is substantially harder than the material of the cup-shaped member, the height of the bar being substantially equal to the depth of the cup, the ends of the bar being cut to form vertical sharp cutting edges for engagement with the side walls of the cup, forcing the bar downwardly into the cup diametrically across it, the length of the bar between the cutting edges being slightly greater than the normal chord of the cup between the points where the cutting edges engage the cup Walls, so that the sharp edges of the bar are caused to cut into the walls of the cup substantially throughout the height o the cup and the bar, the engaging of the cup Walls and the ends of the bar preventing forced rotation of the bar in relation to the cup-shaped member.

4. The method of making a bung, which comprises making a cup-shaped member having an externally extending peripheral flange at its open end, making a bar that is substantially harder than the material in the cup-shaped member, cutting the ends of the bar so that it will have sharp cutting edges along the ends for engaging the walls of the cup, forcing the bar dowln wardly in the cup diametrically across it, the length of the bar being slightly greater than the diameter of the cup so that the sharp cutting edges of the bar are caused to cut into the walls of the cup throughout the distance the bar is forced into the cup, the engaging of the sharp cutting edges of the bar and the walls of the cup preventing forced rotation of the bar in relation to the cup.

5. The method of xing a turning means within the cup portion of a cup-shaped bung, which comprises making a bar of a length suiicient to extend across said cup portion, forming spaced projections along opposite end faces of said bar, forcing said bar dovmwardly into and diametrically across the cup causing the projections on the bar ends to cut slots or grooves into the side wall of the cup, and thereafter deforming the cup wall above the bar to close said slots or grooves to prevent removal of the bar from the bung.

CLEO E. SI-IEPARD. 

